Google put managed agents and Gemini 3.5 Flash into the API story

Google announced Gemini 3.5 Flash, managed agents in the Gemini API and Antigravity updates for agent-first development.

What happened
At Google I/O, Google announced Gemini 3.5 Flash, managed agents in the Gemini API, and new Antigravity and AI Studio capabilities.

Why it matters
Managed execution environments can remove infrastructure work, but they move reliability, observability and vendor constraints into your architecture decision.

For builders
Start with a narrow agent job and explicit limits: allowed tools, maximum steps, timeout, spend cap and a reviewable final artifact.

Try this
Prototype one isolated API workflow before moving a full product loop onto managed agents.

Source
Google: I/O 2026 developer highlights

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